[ubuntu] Core i7 Frequency issue

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Hello!
My system:
i7 920 D0
gigabyte ex58-ud5
3x2GB OCZ Gold pc3 12800
I OC the cpu from bios to 3,4 GHz (200*17), with eist and c1e on it idle at 2,4GHz (200*12). With Win7 it's all right and cpu-z shows that the idle/full frequency works correctly.
In Ubuntu 9.10 64bit that doesn't work.. In idle the cpu runs at about 1,60 GHz and in full sometimes reaches 2.26 GHz.. I tried to look at the gnome frequency scaling applet and it shows available frequency between 1,60 and 2,26 GHz.. So what could i do to make my cpu run correctly at 2,40 or 3,4 GHz?
(Hardware)

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